I know for some of the older games, if you push the B button, you can stop or prevent the evolution of a Pokemon. When you do this, will the Pokemon evolve at the next level or will it remain in its current form? The concern is evolving Eevee into Umbreon and Espeon.

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Your Pokemon will evolve the next time it levels up. So there will be no problem for you if you press B. The only way it wont work is if you press B after it turns level 100 because you cannot level if up again but otherwise, there should be no problem for you.
Source: experience

For example, say your Bulbasaur reaches L.16 and begins to evolve into an Ivysaur. You can STOP the evolution at this point, BUT once your Bulbasaur reaches L.17, it will try to evolve again.
HOWEVER, since Eevee's evolution into Umbreon/Espeon is based on its happiness, you could THEORETICALLY (I haven't tested it yet) get it to not want to evolve the next Level it reaches if you make its happiness go down enough that it wouldn't evolve normally. Again, I haven't tested this, but it would be a good thing to check.